Discoverer Reporting Solution for Multiple Databases

I have to build oracle discoverer reports (single point of access) for four different applications. Each application is having separate databases. So whether i should create separate EULs for each applications (in respective databases) or Should i create a single EUL in any one of the databases and then use db links to connect rermaining databases (for reports from the other applications).
Can u suggest me which method will work good if you see the performace?. I need a dingle point of access for all the discoverer reports.
The worksheets need to be deployed with oracle portal for access of reports in a single click. Is there any way to pre configure the db credentila for each worksheet...?

Hi
My replies below make the assumption that you are not allowed to do any ETL and therefore the data from each database has to be pulled as is. If you do have ETL capability the situation changes dramatically.
In addition to what Sharon has said the cost based optimiizer will have a difficult job rewriting your query efficiently if you use database links, and if you attempt to have queries with some tables from one database and some from another the optimizer will not work at all. I mean. How could it? How could the optimzier in database A know anything about the statistics in databases B, C or D? Wherever the EUL is, that is where the driving optimizer will be so choose wisely obi-wan :-)
For me it's more about user needs than IT needs. If the business has a need to combine data from multiple databases then having a single EUL with database links would be a necessity. However, if they really are disparate systems with nothing in common such as say having Peoplesoft HR in one and E-Busines Suite Inventory in another with perhaps an in-house tracking system in another then I would look at having separate EULs, one in each.
Having one EUL across non-related systems means you have to mix users and roles and can be hard to manage. It actually becomes messy when just two databases are involved never mind four. So even though you might think it is more difficult to maintain 4 EULs, if the objects really are different and you have differing roles and usernames it actually will probably be simpler. They will be simpler to backup, simpler for exporting and importing and it will be faster for Discoverer to maintain workbooks as there will be fewer of them. Plus your system will have access to its local optimzier thereby ensuring the SQL is efficient.
If you are going to use one EUL you need to start out on a sound foundation. This means using libraries to control access too business areas and workbooks. You'll need to adopt some simple naming standards to keep things separate and manageable. I wrote a paper about libraries a few years ago and it is available free of change here on my website: http://ascbi.com/downloads.htm. The paper is called Discoverer Libraries - a Concept.
Best wiishes
Michael

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TODAY: I invite you all to an Oracle BI Applications related Techcast, let's use this for interactive Q&A as well. We can follow up on the question here.
See more details at http://OracleBIWA.org
Wednesday, September 9, 12 noon Eastern
OBIEE Analytics/Reporting Solutions for E-Business Suite
Audio Dial-In: 888 967 2253 Audio Meeting ID: 572994 Audio Meeting Passcode: 334451
Web Conference: https://conference.oracle.com/imtapp/app/cmn_jm_hub.uix?mID=150764532
BIWA Wednesday TechCast Series - Sixth Event!
This presentation will showcase different options for OBIEE-based Analytical Reporting such as:
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It will include real world experiences for implementing BI Apps Version 7.9.6
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While OBIEE and BI Apps are clearly the strategic analytics reporting direction from Oracle, only certain Analytics applications are available. Sometimes all customer needs for BI reporting may not be met by these pre-built analytics. For instance, JD Edwards has pre-built ETL connectors only for Financial Analytics. While more BI Apps and ETL connectors are in the pipeline, how can users meet their reporting needs today as they go live in near future? In this session, we will look at several short and medium term solutions without deviating from the long term strategic goal of using pre-built BI applications to reduce the overall risk.
Several real life situations will be evaluated with demonstration of the steps involved such as how to Migrate Discoverer reports to OBIEE with the highest degree of automation. Likewise, we will cover how DBI views be used for custom OBIEE reporting.
Presenter: Shyam Varan Nath is an OBIEE Architect for IBM Global Business Services with extensive experience in implementing OBIEE and BI Apps. He has worked on several Oracle Data Warehousing Projects for customers including Citigroup, Air Force, Land O'Lakes, and Blue Cross Blue Shield Association. Shyam has been a Certified Oracle DBA since 1998 and has 18 years of industry experience. He is a regular speaker at BIWA Summit, IOUG/Collaborate, Regional User Groups and Oracle Openworld since 2003. Shyam has also worked at Oracle (BI Consulting Practice) and Deloitte Consulting. Currently, he is the top expert in Oracle OBI apps Forum, in terms of user awarded points. Shyam is also the Founder and President of BIWA SIG.
Audio Dial-In: 888 967 2253 Audio Meeting ID: 572994 Audio Meeting Passcode: 334451
Web Conference: https://conference.oracle.com/imtapp/app/cmn_jm_hub.uix?mID=150764532
Compatibility Check: If you have not used Oracle's web conference system before, please ensure your system compatibility by going to https://conference.oracle.com/imtapp/app/nuf_sys.uix.
Edited by: shyamvaran on Sep 9, 2009 5:21 AM

If you would like to share your OBIEE and OBIA knowledge and experiences, please submit your proposals below:
http://submissions.miracd.com/ioug2010/login.asp
Collaborate 2010 (april 18-22) will have a special focus on BI => "Get Analytical with BIWA Training Days"

Use 1 listener for multiple database in a server

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Shivananda Rao wrote:
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(ORACLE_HOME = /oracle/app/oracle/product/10.2.0/db_1)
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Please check the following link -
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Hi,
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When U ran the query for the respective folder, the results were returned in few seconds.
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Hello
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Reporting solution for a very long report

Hi All,
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>
sankar babu wrote:
> Ex:Selection-Screen
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Discoverer Reporting Solution for Multiple Databases

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